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Repeatability (Standard Deviation)
Checking the Repeatability (Standard deviation „S“)
- Refer to the service specifications (see pages 53-54) for the required test
weight.
- Unload the weighing pan/load plate and press t to zero the balance/scale.
- Center the test weight on the weighing pan/load plate.
- Write down the displayed value.
- Repeat this procedure five times.
- Calculate the repeatability of results from these 6 values as follows:
S = (Max. value displayed – Min. value displayed) / 3
- Compare the calculated value with the tolerances listed in the service
specifications.
- If the result exceeds the tolerance limits, this may be due to one of the
following circumstances:
- The weighing system needs to be cleaned
- A mechanical part (e.g., lever) is touching the weighing system
– The place of installation is subject to excessive vibration
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